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EMPLOYEE BENEFIT PLANS EMPLOYEE BENEFIT PLANS (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income tax benefits reclassified from accumulated other comprehensive loss to income tax (expense) benefit    
Income tax benefit $ 1,100 $ 1,100
Retirement Benefits    
Components of net periodic benefit cost (income)    
Service cost 2,076 2,036
Interest cost 4,220 4,574
Expected return on plan assets (6,269) (6,232)
Amortization of prior service cost 28 28
Amortization of net loss 4,913 4,571
Net periodic benefit cost (income) 4,968 4,977
Other Postretirement Benefits Plan    
Components of net periodic benefit cost (income)    
Service cost 115 115
Interest cost 442 442
Expected return on plan assets (722) (722)
Amortization of prior service cost 0 0
Amortization of net loss 1 1
Net periodic benefit cost (income) $ (164) $ (164)